<s>
In	O
computing	O
,	O
the	O
Inter-Client	B-Operating_System
Communication	I-Operating_System
Conventions	I-Operating_System
Manual	I-Operating_System
(	O
ICCCM	B-Operating_System
or	O
I39L	B-Operating_System
short	O
for	O
"	O
I	O
"	O
,	O
39	O
letters	O
and	O
"	O
L	O
"	O
)	O
is	O
a	O
standard	O
protocol	O
for	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
.	O
</s>
<s>
It	O
specifies	O
conventions	O
for	O
clients	B-Protocol
of	O
a	O
common	O
X	B-Protocol
server	I-Protocol
about	O
selections	B-Device
and	I-Device
cut	I-Device
buffers	I-Device
,	O
communication	O
with	O
the	O
window	B-Application
manager	I-Application
and	O
session	B-Device
manager	I-Device
,	O
manipulation	O
of	O
shared	O
resources	O
,	O
and	O
color	O
characterization	O
.	O
</s>
<s>
It	O
was	O
designed	O
by	O
David	O
S	O
.	O
H	O
.	O
Rosenthal	O
of	O
the	O
MIT	O
X	B-Operating_System
Consortium	O
from	O
1987	O
to	O
1989	O
.	O
</s>
<s>
Three	O
window	O
managers	O
in	O
the	O
X11R4	B-Operating_System
contrib	O
directory	O
implemented	O
support	O
for	O
ICCCM	B-Operating_System
:	O
</s>
<s>
selections	B-Device
,	O
session	B-Device
management	I-Device
,	O
and	O
resource	O
sharing	O
.	O
</s>
<s>
X	B-Operating_System
deliberately	O
specifies	O
"	O
mechanism	O
,	O
not	O
policy	O
"	O
for	O
how	O
windows	O
interact	O
.	O
</s>
<s>
As	O
such	O
,	O
an	O
additional	O
specification	O
beyond	O
the	B-Protocol
X	I-Protocol
protocol	I-Protocol
itself	O
was	O
needed	O
for	O
client	O
interoperation	O
.	O
</s>
<s>
The	O
ICCCM	B-Operating_System
specifies	O
cut	O
and	O
paste	O
buffers	O
,	O
window	B-Application
manager	I-Application
interaction	O
,	O
session	B-Device
management	I-Device
,	O
how	O
to	O
manipulate	O
shared	O
resources	O
and	O
how	O
to	O
manage	O
device	O
colours	O
.	O
</s>
<s>
These	O
low-level	O
functions	O
are	O
generally	O
implemented	O
within	O
widget	B-Library
toolkits	I-Library
or	O
desktop	O
environments	O
.	O
</s>
<s>
This	O
isolates	O
application	O
programmers	O
from	O
working	O
directly	O
with	O
the	O
ICCCM	B-Operating_System
itself	O
,	O
as	O
this	O
functionality	O
is	O
delegated	O
to	O
the	O
implementing	O
toolkit	O
.	O
</s>
<s>
The	O
ICCCM	B-Operating_System
has	O
received	O
some	O
criticism	O
for	O
being	O
ambiguous	O
and	O
difficult	O
to	O
implement	O
correctly	O
.	O
</s>
<s>
introduction	O
:	O
"	O
builds	O
on	O
the	O
ICCCM	B-Operating_System
,	O
which	O
defines	O
window	B-Application
manager	I-Application
interactions	O
at	O
a	O
lower	O
level	O
.	O
</s>
<s>
The	O
ICCCM	B-Operating_System
does	O
not	O
provide	O
ways	O
to	O
implement	O
many	O
features	O
that	O
modern	O
desktop	O
users	O
expect.	O
"	O
</s>
<s>
ICCCM	B-Operating_System
on	O
which	O
this	O
specification	O
builds.	O
"	O
</s>
<s>
insofar	O
the	O
EWMH	B-Application
does	O
n't	O
overrule	O
.	O
</s>
<s>
aewm	O
a	O
stacking	B-Device
window	I-Device
manager	I-Device
.	O
</s>
<s>
awesome	O
a	O
dynamic	B-Operating_System
window	I-Operating_System
manager	I-Operating_System
that	O
is	O
configured	O
in	O
Lua	B-Language
.	O
</s>
<s>
enlightenment	B-Application
also	O
serves	O
as	O
a	O
Wayland	O
compositor	O
.	O
</s>
<s>
KWin	B-Language
default	O
window	B-Application
manager	I-Application
and	O
Wayland	O
compositor	O
of	O
KDE	B-Language
Plasma	I-Language
.	O
</s>
<s>
Metacity	B-Language
default	O
window	B-Application
manager	I-Application
of	O
GNOME	B-Language
2	I-Language
.	O
</s>
<s>
Openbox	B-Language
the	O
default	O
window	B-Application
manager	I-Application
used	O
by	O
LXDE	B-Language
and	O
LXQt	B-Language
.	O
</s>
